[Bug 91202] output to DVI-I is blank - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 91202] output to DVI-I is blank
Date: Fri, 03 Jul 2015 01:22:44 +0000	[thread overview]
Message-ID: <bug-91202-502@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=91202

            Bug ID: 91202
           Summary: output to DVI-I is blank
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: bpaterni@gmail.com

Created attachment 116902
  --> https://bugs.freedesktop.org/attachment.cgi?id=116902&action=edit
dmesg for e965b8ce4215ac2b22b23ffc8a8dfbae964b9496

I have a radeon r9 285 (tonga) and I'm trying to run dual DVI displays via the
new AMDGPU driver. The problem I'm having though is that the display connected
to the DVI-I output goes blank during drm initialization on boot, and
thereafter never 'recovers'. If I plug either DVI-D or DVI-I in individually,
however, and disconnect the other on a fresh boot, either outputs work just
fine. Additionally, dual displays do work if I use any combination of DVI-D,
HDMI, or DisplayPort; which leads me to believe that the problem has something
to do with how amdgpu is handling output to DVI-I or a hardware problem.
Hopefully it is not the latter.

Please let me know if there is anything I can do to help debug this problem!

I'm using Debian unstable, with the latest linux kernel compiled from git
mainline (e965b8ce4215ac2b22b23ffc8a8dfbae964b9496)

dmesg and Xorg log should be attached.

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